Engine temp degrees?
Senior Member
Joined: Jan 2018
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I'm having the same issues with my 2018 3.5L EcoBoost and have been dealing with it since September. There is no definitive fix as of now, I've been researching this for months. Replacing the radiator and/or thermostat works for some but not everyone. Unfortunately most guys have been trading in their trucks after a few attempts to fix it. The last answer I got from my dealership was that Ford is aware of this issue but does not have a fix for it per a field engineer. My dealership is going to call me to bring my truck in when that engineer is at the dealership again. Just to be clear, your issues are unloaded, not towing anything correct? Most guys have this issue towing, which is not the case with me.
Member
Joined: Jul 2019
Posts: 89
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From: Massachusetts
The thermostat has been replaced and I don't want to have an aftermarket thermostat installed because I'm still under warranty. I assume all the dealerships bled it correctly, which I have no way to confirm. I've personally have tried burping it on 2 different occasions. I even tried it on a very steep hill with the front end on the high side and nothing has helped. I think the 1st dealership I went to that did the cam phaser tsb messed something up putting my truck back together. Unfortunately, I can't convince Ford corporate to have the dealership redo the tsb. The 1st dealership I went to has a terrible reputation, I found out later. Autofair Ford in Haverhill Massachusetts, avoid at all costs.
5 Year Member
Joined: Aug 2018
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From: Kentucky
edit: found a post today discussing how a blockage in the radiator anecdotally was the source of spiking coolant temps and resolved by replacing the thermostat and radiator to new OEM: https://www.f150forum.com/f118/ecobo...441933/index5/
5 Year Member
Joined: Jul 2015
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From: Durham, NC
Get a cheap infrared thermometer and check the temp across your radiator, top to bottom, in the middle, with the fan running. Works just as well if you put a decent size fan to blow into the grill. If it gets cooler as you move closer to the bottom of the radiator, there's a blockage.
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Joined: Jan 2018
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Joined: Feb 2021
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@Mferry22 Thanks for the response; unloaded on my end as well - no significant payload and no towing.
@Flamingtaco @Takeda Agree with @Vtec187 , according to the workshop manual, the top hose is the radiator inlet (hot) side and the bottom is the cooled radiator outlet. As the radiator does its' job of heat exchange with the air, my thought is that you would expect a temperature difference between the top and bottom of the radiator as the coolant loses heat on the way through.
@Flamingtaco @Takeda Agree with @Vtec187 , according to the workshop manual, the top hose is the radiator inlet (hot) side and the bottom is the cooled radiator outlet. As the radiator does its' job of heat exchange with the air, my thought is that you would expect a temperature difference between the top and bottom of the radiator as the coolant loses heat on the way through.
5 Year Member
Joined: Jul 2015
Posts: 2,642
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From: Durham, NC
